After reviewing thousands of SAT essays and practice exams, one thing stands out: most mistakes stem from just a few fundamental rules.
This guide condenses years of classroom expertise into a concise toolkit you can deploy instinctively on test day.
Study it, internalize it, and review it daily until these rules become second nature.
SECTION 1: Sentence Boundaries
Keeping Your Ideas Whole
Why this matters: Fragments, run-ons, and misused punctuation are among the easiest errors to spot and correct.
- Complete Thought Test
Every sentence requires a subject, a finite verb, and a complete idea.
Fragment: “Because she practiced all night.”
Correction: “Because she practiced all night, she mastered the passage.” - Run-Ons & Comma Splices
Two independent clauses cannot ride together on a single comma.
Wrong: “The experiment was a success, we celebrated all afternoon.”
Fixes:- a) Add a conjunction: “…success, and we celebrated…”
- b) Use a semicolon: “…success; we celebrated…”
- c) Split into two sentences.
- Semicolons as “Soft Periods”
Link two closely related independent clauses without a conjunction.
Example: “She revised her thesis; she still feared it lacked clarity.” - Colons for Emphasis or Lists
A colon follows a complete sentence and introduces an explanation, list, or quotation.
Example: “He faced one choice: withdraw or proceed.” - Em Dashes for Dramatic Pauses
Use the em dash (—) to insert an abrupt break or strong emphasis.
Example: “The results—unanticipated and thrilling—reshaped our research.”
SECTION 2: Form & Structure
Ensuring Agreement and Clarity
Why this matters: Consistency and precision in grammar boost your credibility and your score.
- Subject-Verb Agreement
Subjects and verbs must agree in number, ignoring intervening phrases.
Correct: “The bouquet of wildflowers brightens the room.” - Pronoun-Antecedent Agreement
A pronoun must match its antecedent in number and gender.
Formal: “Each student must submit his or her essay.”
Plural: “Students must submit their essays.” - Clear Pronoun Reference
Pronouns must refer unambiguously to one noun.
Ambiguous: “When Alex greeted Jordan, he was surprised.”
Clear: “When Alex greeted Jordan, Jordan was surprised.” - Consistent Verb Tense
Maintain the same time frame unless context dictates a shift.
Smooth: “Last summer she trained daily and improved rapidly.” - Correct Verb Forms
Use correct irregular verbs and participles.
Right: “She has chosen her topic wisely,” not “has chose.” - Modifier Placement
Place modifiers next to the words they describe.
Dangling: “Walking to campus, the rain drenched my notes.”
Corrected: “As I walked to campus, the rain drenched my notes.” - Parallel Structure
Use the same grammatical form in lists and comparisons.
Example: “The course includes reading, writing, and analyzing.” - Logical Comparisons
Ensure you compare equivalent elements.
Faulty: “This novel is more compelling than her writing.”
Accurate: “This novel is more compelling than her short story.” - Logical Order & Cohesion
Arrange words and sentences so ideas flow logically. Introduce nouns before pronouns and guide the reader toward your main point.
SECTION 3: Sense & Usage
Sound Natural, Read Smoothly
Why this matters: This section tests your “ear” for correct English.
- Commonly Confused Words
its/it’s | their/there/they’re | affect/effect | than/then | your/you’re
Tip: Substitute “it is” for “it’s”—if it works, the apostrophe belongs. - Idiomatic Expressions
Some verbs/adjectives pair with fixed prepositions:
“rely on,” “interested in,” “responsible for,” “accused of.”
Strategy: Flash-card these collocations until they feel automatic. - Conciseness
The SAT favors clarity and brevity. Eliminate redundant words.
Wordy: “Due to the fact that she studied, she did well.”
Lean: “Because she studied, she did well.” - Formal Register
Avoid slang, contractions, and overly casual phrasing.
Use “because” not “’cause,” “cannot” not “can’t.” - Apostrophes
• Singular possessive: student’s book
• Plural possessive: students’ books
• It’s = it is; its = possessive - Comma Rules
• After an introductory phrase: “In the meantime, we waited.”
• Around non-essential clauses: “Her car, which was new, stalled.”
• Between list items: “apples, oranges, and grapes.”
• Never between subject and verb. - Which vs. That
“Which” introduces non-essential clauses (use commas).
“That” introduces essential clauses (no commas). - Question & Exclamation Marks
Use question marks for direct questions; exclamation points rarely appear on the SAT. - Hyphens in Compound Modifiers
Hyphenate compound adjectives before a noun:
“A well-designed study” vs. “The study was well designed.” - Numbers: Words vs. Numerals
Spell out one-word numbers (one–nine); use numerals for 10 and above, unless the sentence begins with a number. - Capitalization
Capitalize the first word of a sentence, proper nouns, and official titles when used with names.
Quick Five-Step Strategy on Test Day
- Read in Context: Always read the entire sentence, plus the one before or after if needed.
- Predict the Rule: Identify which of these 25 rules applies before viewing answer choices.
- Eliminate Errors: Discard any choice that introduces a new mistake.
- Favor Conciseness: When torn between long and short, the concise option usually wins.
- Trust Your Toolkit: If your prediction matches one of these rules, go with it.
How to Make These Rules Stick
- Flashcards: Rule name on one side; SAT-style example and correction on the other.
- Peer Teaching: Explaining a rule aloud cements your mastery.
- Mini-Drills: Five targeted questions each night—avoid marathon sessions.
- Timed Practice: Weekly 35-minute Writing & Language section to build stamina.
Conclusion
Mastering SAT grammar isn’t about drowning in endless details; it’s about internalizing a compact, reliable toolkit. Drill these 25 rules until they become second nature, and you’ll approach every question with confidence rather than doubt. Happy studying, and may every comma land exactly where it belongs!
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